Ranes
Adventurer
I feel as if it needs something else, like one spell-like power.
Indeed. I just looked again at their 3e incarnation and have to correct my earlier post. The 3e version can still fly, create illusions, turn invisible and more. I don't know about 4e but this 5e version is palpably less interesting, unless there are additional abilities listed elsewhere, perhaps for devils in general.
Otherwise, is this characteristic of 5e monsters in general, that they're just less interesting than they used to be?